EP2582508A1 - Procede d'extrusion de film et appareil pour cette extrusion - Google Patents

Procede d'extrusion de film et appareil pour cette extrusion

Info

Publication number
EP2582508A1
EP2582508A1 EP11729081.7A EP11729081A EP2582508A1 EP 2582508 A1 EP2582508 A1 EP 2582508A1 EP 11729081 A EP11729081 A EP 11729081A EP 2582508 A1 EP2582508 A1 EP 2582508A1
Authority
EP
European Patent Office
Prior art keywords
chamber
die
molten polymer
exit slot
outlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP11729081.7A
Other languages
German (de)
English (en)
Other versions
EP2582508B1 (fr
Inventor
Ole-Bendt Rasmussen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RASMUSSEN, OLE-BENDT
Original Assignee
Rasmussen Ole-Bendt
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rasmussen Ole-Bendt filed Critical Rasmussen Ole-Bendt
Publication of EP2582508A1 publication Critical patent/EP2582508A1/fr
Application granted granted Critical
Publication of EP2582508B1 publication Critical patent/EP2582508B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/255—Flow control means, e.g. valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/365—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using pumps, e.g. piston pumps
    • B29C48/37—Gear pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/72—Feedback means, i.e. part of the molten material being fed back into upstream stages of the extruder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0254—Coating heads with slot-shaped outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92514—Pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92904—Die; Nozzle zone

Definitions

  • the invention concerns a method of forming a film by extruding a molten polymer material through a flat monoextrusion die, and the apparatus for carrying out this method.
  • monoextrusion of film it is meant extrusion of a mono-component, monolayered film as opposed to the coextrusion of bicomponent or multicomponent film.
  • Monocomponent, monolayered film extruded from a flat die is used in itself, e.g. for manufacture of plastic bags or as wrapping film for a variety of packaging purposes. It is also used, normally in form of a very thin and still molten film, as it comes out of the flat die, for coating or extrusion lamination of other film materials.
  • the present invention is conceived with a particular view to such coating or extrusion lamination applications, although it also with advantage can be used in itself for bag making, wrapping etc.
  • One objective is to reduce any tendency to stagnation and reduce the average dwell time of the molten polymer in the die, and thereby reducing the tendency to degradation and/or gel formation. As a consequence higher die temperatures can be applied.
  • This improvement will enable a reduction of the film thickness without risk of break.
  • the invention aims at cost reductions in the construction of the die, compared to current designs of flat monoextrusion dies.
  • the gap of the exit slot in the "coat hanger die” is adjustable by means of a row of screws or similar to compensate for the relatively big pressure differences between the middle and each side end of the channel.
  • the method of the present invention is disclosed in claim 1.
  • the apparatus of the present invention is disclosed in claim 11.
  • the circulating character of the flow essentially reduces the tendency to stagnation and the like and enables a reduction of the average dwell time in the die.
  • the equalizing effect of the circulation enables a strong heating of the die, and thereby it becomes possible to keep the temperature of the material in the extruder much lower than the temperature of the material in the die. This furthermore reduces the tendency to degradation and/or gel formation.
  • the molten polymer material is formed into only one flow parallel with the major dimension of the exit slot by being fed by a pump (5) from chamber inlet (7) at one side of the chamber to the chamber outlet (8) at the other side of the chamber.
  • an embodiment of the invention is characterised in that the pressure of the molten polymer material inside the chamber (4) is controlled by a variable valve inserted between the chamber outlet (8) and the pump (5).
  • Another embodiment of the invention is characterised in that the throughput of molten film forming material through the exit slot (2) is lower than 50%, preferably lower than 25%, and most preferably lower than 15% of the throughput of molten material passing out of the chamber outlet (8).
  • a third embodiment of the invention has for its object the means which secures that the film coming out of the exit slot (3) has the same thickness all over. In the conventional construction of a flat die, this is secured by a row of adjustment screws - as already mentioned - which is an expensive construction.
  • the gap of the exit slot (3) is constant from one side to the other, while the distance through which the material passes through the slot gradually varies from a higher value adjacent to the chamber inlet (7) to a lower value adjacent to the chamber outlet (8), to compensate for the pressure drop in the chamber from said inlet to said exit.
  • one advantage of the invention is that the temperature within the die can be kept much higher than the temperature of the polymer material leaving the extruder.
  • the circulation of the flow plays an important role since it helps to keep the temperature even within the die also when a strong heating of the latter takes place.
  • a further embodiment of the invention is characterised in that the temperature of the film (1) as it leaves the exit slot (3) is at least 20°C higher than the temperature of the fresh molten polymer material administered from the reservoir, as this material enters the circulating polymer flow.
  • the die is fed from chamber inlet (7) at one side of the chamber, goes out of the chamber outlet (8) at the other side of the chamber and is recirculated to the inlet (7).
  • This has several advantages as explained above.
  • This modification of the invention does not have the effect to provide the above mentioned possibility of a facilitated start up, but it can nevertheless be preferable if the die is several meter long.
  • Fig. 1 is a view perpendicular to the plane formed by the extruded film. It shows the flat die including, very schematically, a diagram like presentation of the system for circulating the molten polymer material, whereby it is pumped into one end of the die and leaves the other end of the die.
  • Fig. 2 is a cross section through the flat die.
  • Figs. 3, 4 and 5 are principal sketches, which schematically show three different embodiments of the invention, each operating with more than one circulating flow.
  • the film (1) of molten material leaves the die in direction (2), coming out of the exit slot (3).
  • This slot is an integral part of the die chamber
  • the chamber and the exit slot are formed between the two die parts (9) and (10) which are fixed to a dieblock (1 1) by means of screws, indicated by the lines (12). Tracks (13) secure a precise fitting.
  • the ends of the die are formed by the endparts (14) and (15), which are screwed to the dieparts (9) and (10) and to the dieblock (11). (The screws are not indicated).
  • the molten material is fed by the pump (5) from chamber inlet (7) through the chamber (4) in a flow direction (6) which is transverse of the direction (2) in which the film leaves the die.
  • the transverse flow leaves the chamber (4) through the chamber outlet (8).
  • the throughput through chamber outlet (8) exceeds the throughput through the exit slot (3), e.g. it may be about 10 times as high.
  • a valve (16) controls the pressure at the chamber outlet (8), and a second pump (17) may assist pump (5).
  • the two pumps must be adapted to work at the same throughput. From pump (17) the flow is pumped back to pump
  • the pump may be a gearwheel pump.
  • Fresh molten material is fed into the system from a reservoir through a pipe (18) which is perpendicular to the view plane.
  • the fitting between this pipe and the conducts between pump (5) and inlet (7) is adapted to allow the whole die including pumps and recirculation channel part to swing away from the take off means during start up.
  • the molten polymer material is directed, as indicated by the arrows (2), into one or more pumps (5), and is pumped, as shown by arrows (21), into an inlet to the die chamber (4).
  • Valves (16) control the pressure in the chamber. Having left the chamber, the molten material flows back towards pump (5) as indicated by arrows (19).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

La présente invention concerne un procédé de formation de film (1) en matériau polymère fondu, par extrusion dudit matériau dans un sens (2) à partir d'une fente de sortie étroite (3), laquelle fait partie intégrante d'une chambre de filière plus large (4) dont la principale dimension d'extension est parallèle à la principale dimension de la fente de sortie (3), caractérisé en ce que le matériau polymère fondu est formé en un ou plusieurs flux généralement parallèle(s) à ladite principale dimension de la fente de sortie (3), chaque flux étant pompé dans un dispositif de recirculation depuis l'orifice d'entrée de la chambre (7) vers l'orifice de sortie (8) à travers des conduites reliant l'orifice d'entrée et l'orifice de sortie, tandis qu'un matériau polymère fondu nouveau est administré depuis un réservoir dans chaque flux de recirculation.
EP11729081.7A 2010-06-17 2011-06-17 Procede d'extrusion de film Not-in-force EP2582508B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB1010158.2A GB201010158D0 (en) 2010-06-17 2010-06-17 A method of film extrution and apparatus for such extrusion
PCT/EP2011/060170 WO2011157843A1 (fr) 2010-06-17 2011-06-17 Procede d'extrusion de film et appareil pour cette extrusion

Publications (2)

Publication Number Publication Date
EP2582508A1 true EP2582508A1 (fr) 2013-04-24
EP2582508B1 EP2582508B1 (fr) 2018-02-07

Family

ID=42471790

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11729081.7A Not-in-force EP2582508B1 (fr) 2010-06-17 2011-06-17 Procede d'extrusion de film

Country Status (5)

Country Link
US (1) US9849641B2 (fr)
EP (1) EP2582508B1 (fr)
BR (1) BR112012032221A2 (fr)
GB (1) GB201010158D0 (fr)
WO (1) WO2011157843A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3221118B1 (fr) 2014-11-19 2022-07-27 ExxonMobil Chemical Patents Inc. Système de traitement de polymères, et procédé associé
US11383416B2 (en) 2015-12-16 2022-07-12 Exxonmobil Chemical Patents Inc. Devices, systems, and processes for processing polymers
WO2017105632A1 (fr) 2015-12-16 2017-06-22 Exxonmobil Chemical Patents Inc. Dispositif et procédé pour traiter des polymères
EP3381572A1 (fr) * 2017-03-29 2018-10-03 Nederlandse Organisatie voor toegepast- natuurwetenschappelijk onderzoek TNO Appareil et procédé de revêtement à fente

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6064662A (ja) * 1983-09-19 1985-04-13 Fuji Photo Film Co Ltd 塗布方法
JPS60143866A (ja) * 1983-12-29 1985-07-30 Konishiroku Photo Ind Co Ltd 塗布方法及びその装置
JP2565413B2 (ja) * 1990-04-13 1996-12-18 富士写真フイルム株式会社 塗布方法及び装置
US6007319A (en) * 1993-11-30 1999-12-28 Continuous Molding, Inc. Continuous forming of complex molded shapes
EP1370405A1 (fr) * 2001-03-23 2003-12-17 RPC Cobelplast Montonate S.R.L. Tete d'extrusion a largeur reglable pour l'extrusion de polymeres rapidement thermodegradables, et procede d'extrusion mettant en oeuvre cette tete

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2011157843A1 *

Also Published As

Publication number Publication date
EP2582508B1 (fr) 2018-02-07
GB201010158D0 (en) 2010-07-21
WO2011157843A1 (fr) 2011-12-22
BR112012032221A2 (pt) 2016-11-29
US20130181364A1 (en) 2013-07-18
US9849641B2 (en) 2017-12-26

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